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nnMain just initializes [[RO_services|ro:1]], then starts hosting the service from the main-thread with max_sessions=1 (threads are not created for service-hosting).
nnMain just initializes [[RO_services|ro:1]], then starts hosting the service from the main-thread with max_sessions=1 (threads are not created for service-hosting).
This is intended to only be used by Applications. The initialization in sdknso uses [[Applet_Manager_services#PrepareForJit|PrepareForJit]] at the start. sdknso later uses [[SVC|svcCreateCodeMemory]].
This is intended to only be used by Applications. The service-init in sdknso just uses [[Applet_Manager_services#PrepareForJit|PrepareForJit]] at the start, then gets the service.
sdknso CreateJitEnvironment implements the remaining initialization. After some validation, this uses [[SVC|svcCreateCodeMemory]] (can be called twice). Then [[#CreateJitEnvironment]] is used. TransferMemory with an user-specified buffer is created with permissions=None, which is then used with [[#LoadPlugin]]. When successful, this lastly uses [[#GetCodeAddress]].
This loads the user-specified [[NRO]] into sysmodule-context ("DllPlugin"), and calls various symbols from that NRO. It seems the code writing (in cmd GenerateCode) is done via symbol-calling, allowing the NRO to handle input_buffer->code translation+writing.
This loads the user-specified [[NRO]] into sysmodule-context ("DllPlugin"), and calls various symbols from that NRO. It seems the code writing (in cmd GenerateCode) is done via symbol-calling, allowing the NRO to handle input_buffer->code translation+writing.
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Cmd || Name || Notes
! Cmd || Name
|-
|-
| 0 || CreateJitEnvironment || Returns an [[#IJitEnvironment]]
| 0 || [[#CreateJitEnvironment]]
|-
|-
|}
|}
== CreateJitEnvironment ==
Takes two input u64s, 3 input handles, returns an [[#IJitEnvironment]].
= IJitEnvironment =
= IJitEnvironment =
! Cmd || Name
! Cmd || Name
|-
|-
| 0 || GenerateCode
| 0 || [[#GenerateCode]]
|-
|-
| 1 || Control
| 1 || [[#Control]]
|-
|-
| 1000 || LoadPlugin
| 1000 || [[#LoadPlugin]]
|-
|-
| 1001 || GetCodeAddress
| 1001 || [[#GetCodeAddress]]
|}
|}
== GenerateCode ==
Takes an u32, an u64, a [[#CodeRange]], a [[#CodeRange]], a [[#Struct32]], a type-0x5 input buffer, a type-0x6 output buffer, and returns an output s32, a [[#CodeRange]], a [[#CodeRange]].
== Control ==
Takes an input u64, a type-0x5 input buffer, a type-0x6 output buffer, and returns an output s32.
== LoadPlugin ==
Takes an input u64, a handle, two type-0x5 input buffers, no output.
== GetCodeAddress ==
No input, returns two output u64s which are loaded from state.
== CodeRange ==
This is "nn::jit::CodeRange". This is a 0x10-byte struct. This is 8-byte aligned.
== Struct32 ==
This is "nn::jitsrv::Struct32". This is a 0x20-byte struct. This is 8-byte aligned.